I got runner's knee in the second week from overdoing it. I took a week off and have started back at 2 miles–slowly. My knee feels fine so far.
There's something wonderful about weighted rucking. Not sure why.
I've got a 30lb plate on backlog order. But I am going to progress slowly from now on.;-)
I had a slight tear on my left meniscus (knee) about 20 years ago. It was painful. It healed up pretty good without surgery, but I always wear a tight knee brace. Hiking poles offload the knees a bit. So far, so good.